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--- start [2026/03/22 19:54] – [Calibration — Wi-Fi gateways] admin
+++ start [2026/05/14 20:28] (current) – [Barometer troubleshooting] admin
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 Barometers and their pressure readings and related calculations can be difficult to understand, so much so that until now, only a very small percentage of station owners have successfully managed to properly set-up or even use their barometers. However, this all changed with the introduction of Ecowitt's new automatic barometer firmware update in 2025.
-Ecowitt's new sea level pressure (SLP) firmware update is a radical departure from the previous algorithm, where sea level pressures were somewhat crudely approximated using a simple fixed offset. From now on, SLP (mean sea level pressure) will be automatically and continuously calculated based on changes in station pressure, outside temperatures and humidity. This new update will greatly increase the accuracy of sea level pressure calculations. It will also make the initial set-up of the barometer much easier, requiring the user to only input their barometer altitude above sea level. No more manual calculations required!
+Ecowitt's new sea level pressure (SLP) firmware update is a radical departure from the previous algorithm, where sea level pressures were somewhat crudely approximated using a simple fixed offset. SLP (mean sea level pressure) is now automatically and continuously calculated based on changes in station pressure, outside temperatures and humidity. This new update greatly increases the accuracy of sea level pressure calculations. It will also make the initial set-up of the barometer much easier, requiring the user to only input their barometer altitude above sea level. No more manual calculations required!
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-One of its first important uses was for sailing ships more than three hundred years ago. Sailors noted that changes in atmospheric pressure were related to wind and gale.  Wind causes waves. Big waves sink ships and loses lives. Therefore, barometers became increasingly important. Even today, all ships still have analogue
+One of its first important uses was for sailing ships more than three hundred years ago. Sailors noted that changes in atmospheric pressure were related to wind and gale.  Wind causes waves. Big waves sink ships and loses lives. Therefore, barometers became increasingly important. Even today, ships still have analogue (dial type) barometers on board should all the electronics fail.
-(dial type) barometers on board should all the electronics fail.
-In modern times, we now have aircraft and they too, have barometers aka "altimeters". And just like for ships, they can also save lives. Altimeters help maintain safe separation between aircraft and terrain.
+In modern times, we now have aircraft and they too, have barometers aka "altimeters". And just like for ships, they can also save lives. Altimeters help maintain safe separation between other aircraft and terrain.
-Needless to say, in addition to weather forecasting purposes, barometers are safety-critical instruments for air, land and sea. Despite their importance, most people would have no idea (or care to know), how they work or how to use them.
+Needless to say, in addition to weather forecasting purposes, barometers are safety-critical instruments for air, land and sea. Despite their importance, most people would have no idea how they work or how to use them.
 But the barometer is different. Unlike most weather sensors, it has predictive qualities, which is a key element of weather forecasting.
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 Why devote an entire wiki to just one weather sensor?
-Barometers, can be one of the most difficult weather sensors to set up properly. My informal annual survey of surrounding weather stations reveals that only a few percent of weather station owners have managed to successfully set up and calibrate their barometers.
+Barometers, can be one of the most difficult and frustrating weather sensors to set up properly. My informal annual survey of surrounding weather stations reveals that only a few percent of weather station owners have managed to successfully set up and calibrate their barometers.
 Hopefully, these guides, tutorials and how-to's will shed some light on the subject of barometers - what they are measuring, how to set them up and how to keep them calibrated and accurate,
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 ===== Barometer troubleshooting =====
-updated 23 Dec 2025
+updated 14 May 2026
 Ecowitt rolled out a new firmware update in 2025 that dynamically calculates SLP (sea level pressure) factoring in elevation, station pressure,temperature and humidity. This new update is a radical departure from the previous algorithm, where sea level pressures were somewhat crudely approximated using a simple fixed offset.
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 **Resources:**
-QFE calculator: This calculator uses the term QFE instead of station pressure. QFE is the aviation equivalent to station pressure.
+QFE calculator: This calculator uses the term QFE instead of station pressure. QFE is the aviation equivalent to station pressure. Click on the QFE button to start and enter in your elevation and sea level pressure/QNH.
-See example:https://www.sensorsone.com/elevation-station-qfe-sea-level-qnh-pressure-calculator/?ab=2&v0=300&f0=m&v1=975&f1=hPa&f2=hPa
+See:https://www.sensorsone.com/elevation-station-qfe-sea-level-qnh-pressure-calculator
 Note: For North America and jurisdictions that use altimeter setting instead of QNH, put the altimeter setting value of your airport into the QNH input box of the the calculator.